Please don't attack me for making a comment about a character who did, indeed, grow up as part of the millennial generation and, just as you and I were influenced by the time we grew up in, will have been influenced by her 'time'. This does not mean all 'bad' for any generation, it just means your character is influenced, sometimes more, sometimes less, by the time you grew up in. If you feel it is all nonsense please 'attack' the phycologists who did the research - not me!
Because I am reading a lot at the moment about educating the millennial generation it is probably at the front of my mind but I had no intention to insult your millennials or, indeed 'Pip'. More to the point I would suggest that each generation can be difficult for another to understand as they were just not influenced by the same things.
In this list you can see that the characteristics are neither all positive or all negative but rather influences one of which - because of the way their parents and grandparents brought them up - is "They have been told over and over again that they are special, and they expect the world to treat them that way.", and you can see how difficult this can be for millennials going out into the world - including ours who are also a joy.